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Can anyone tell me what this fish might have died from? As of two days ago it was acting normally, and not showing any issues. It started to act lethargic today and was pale, so I netted it and put it into QT. Was seemingly ok, but then developed these what appears to be hemorrhages all over its body within a period of about 45 minutes, then died. I did find another dead danio this evening in the tank, but it did not have any of these spots.

Any ideas?

First off, tank parameters:

Ammonia 0
Nitrites 0
Nitrates 0
pH 8
GH Very soft (1 drop on the API test)
KH 12 drops on the API test

 

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From what I have seen with my own eyes, its a really fast acting nasty bacterial infection. Never got the name or how to get it to go away. The infected fish died off, tank was left empty for a week, and the new fish never got it.
 

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Yep, that's definitely septicemia. Furan 2 followed by Triple Sulfa usually knocks it out. But there's usually an underlying cause to it, like low oxygen or high nitrates.
 
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